Leveling system

ABSTRACT

A leveling system for leveling a table having a top surface and at least three legs. The leveling system including at least three sensor bars that act as individual digital levels adapted to be placed on top surface of the table. The leveling system including a leg movement system adapted to be attached to the table and adapted to raise and lower the legs to achieve a level top surface. The leveling system including a controller system that is connected to the sensor bars to receive data from the sensors bars and to the leg movement system to command movement of the leg movement system that is adapted to raise and lower the table, the controller system including a leveling software algorithm which inputs the data from the sensor bars and controls activation of the leg movement system.

This application claims the benefit of and incorporates by referenceU.S. Provisional Applications No. 62/630,434, filed Feb. 14, 2018.

BACKGROUND

The present invention generally relates to leveling of a surface. Morespecifically, the present invention relates to a leveling of a surfacewith adjustable legs.

Leveling a table within +/−0.01 degrees by adjusting leg height using ahand level can be a difficult task and take up to an hour or more toperform. Most leveling systems associated with gaming tables, especiallypool tables include mechanical adjustments to the table surface insteadof the legs. These systems are complicated and expensive, as they mustbe built into the table and thereby cannot be used with another table.It would be simpler to have a portable system that could be used withdifferent tables to adjust table leg height.

It is an object of the present invention to provide leveling system tolevel tables that is portable and adjusts leg height.

SUMMARY

A leveling system for leveling a table having a top surface and at leastthree legs. The leveling system including at least three sensor barsthat act as individual digital levels adapted to be placed on topsurface of the table. The leveling system including a leg movementsystem adapted to be attached to the table and adapted to raise andlower the legs to achieve a level top surface. The leveling systemincluding a controller system that is connected to the sensor bars toreceive data from the sensors bars and to the leg movement system tocommand movement of the leg movement system that is adapted to raise andlower the table, the controller system including a leveling softwarealgorithm which inputs the data from the sensor bars and controlsactivation of the leg movement system.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a leveling system according to thepresent invention.

FIG. 2 is a perspective view of a controller system according to thepresent invention.

FIG. 3 is a side view of a controller system according to the presentinvention.

FIG. 4 is a side view of a controller system according to the presentinvention.

FIG. 5 is a top view of a controller system according to the presentinvention.

FIG. 6 is a schematic of a leveling system according to the presentinvention.

FIG. 7 is a schematic of a leveling system according to the presentinvention.

FIG. 8 is a schematic of a leveling system according to the presentinvention.

FIG. 9 is a schematic of a leveling system according to the presentinvention.

FIG. 10 is a flow chart of a leveling system algorithm according to thepresent invention.

FIG. 11 is a side view of a level according to the present invention.

FIG. 12 is a perspective view of a leg according to the presentinvention.

FIG. 13 is a cutaway side view of a leg movement system to the presentinvention.

FIG. 14 is a cutaway side view of a leg movement system to the presentinvention.

FIG. 15 is a perspective view of a drive bolt according to the presentinvention.

FIG. 16 is a side view of a motor mount according to the presentinvention.

FIG. 17 is a side view of a motor mount according to the presentinvention.

FIG. 18 is a front view of a motor mount according to the presentinvention.

FIG. 19 is a perspective view of a leg movement system according to thepresent invention.

FIG. 20 is a side view of a leg movement system according to the presentinvention.

FIG. 21 is a perspective view of a leg movement system according to thepresent invention.

FIG. 22 is a cutaway side view of a leg movement system according to thepresent invention.

FIG. 23 is a perspective view of a leg movement system according to thepresent invention.

FIG. 24 is a cutaway side view of a leg movement system according to thepresent invention.

FIG. 25 is a cutaway side view of a leg movement system according to thepresent invention.

FIG. 26 is a side view of a limit switch assembly according to thepresent invention.

FIG. 27 is a side view of a limit switch assembly according to thepresent invention.

FIG. 28 is a front view of a limit switch assembly according to thepresent invention.

FIG. 29 is a cutaway bottom side view of a motor assembly according tothe present invention.

DETAILED DESCRIPTION

The present invention is a leveling system with different components, asshow in FIGS. 1-29. The leveling system is adapted to level gamingtables, especially pool tables. The leveling system includes a sensorsystem, a controller system and a leg movement system. FIG. 1 shows apool table with the sensor system and the controller system. The sensorsystem includes three sensor bars. FIG. 1 shows a first sensor bar 1 ona left end of the table, a second sensor bar 2 in the middle of thetable and a third sensor bar 3 on a right end of the table. Each sensorbar includes a sensor foot 10 on each end of the sensor bar. Each sensorbar is shown with one foot designated as the (+) foot and one footdesignated as the (−) foot. Each sensor bar includes a sensor enclosure12 mounted on top and in the middle of the sensor bar. The sensorenclosure 12 houses an accelerometer, microcontroller and an analog todigital convertor (ADC)(not shown). The accelerometer is in the form ofan inclinometer. The accelerometer in the sensor enclosure 12 sensesmovement of the sensor bar up and down at each foot 10 of the sensorbar. The sensor enclosure 12 includes a sensor bar cable 14 extendingfrom the sensor enclosure 12 that is for communication between themicrocontroller and the controller system and to provide power toaccelerometer, microcontroller and ADC. The sensor enclosure 12 includesan indicator light 16 on the outside surface of the sensor enclosure 12.The first sensor bar 1, second sensor bar 2 and the third sensor bar 3are placed on top of the playing surface 18, as shown in FIG. 1. Wherethe first sensor bar 1 and third sensor bar 3 are at the ends of thetable oriented in the X direction and the second sensor bar 2 is in themiddle of the table oriented in the Y direction. Whereby, the Ydirection is perpendicular to the X direction. The sensor bars are usedto precisely measure the inclination of the playing surface 18 in2-dimensional directions of both the X direction and Y direction.

FIGS. 1-5 show components the controller system. The controller systemincludes a controller housing 20. The controller housing 20 includesfour leg cable ports 22 for connection of four leg cables 24 that arealso connected to the leg movement system. The controller housing 20includes a power port 26 for connection of AC power, which is typically110 VAC. The controller housing 20 includes three sensor ports 28 forconnection of the sensor bar cables 14 that are also connected to thesensor bars. The controller housing 20 includes a display 30 that is avideo touch screen to provide the user data and control of electronics.The display 30 can provide system information/function menu, inclinationreadings for each sensor, calibration test, calibration routine, manualmotor jogging and a transportation mode. The controller housing 20includes a main button 32 to be used to start the leveling process. Themain button 32 can also be used to select run-time modes (Calibration,Discovery, Abort, Initialize). The button 32 is encircled in a RGB (Red,Green, Blue) LED indicator light 34 to be used to display statusinformation to the user. FIG. 5 shows an internal top view of thecontroller housing 20 to show the controller housing 20 includeselectronics 36. The electronics 36 include a microcontroller, DC motordriver integrated circuits, an analog-to-digital integrated circuit andconnections for the leg cable ports, power port and sensor ports. Themicrocontroller is part of the main control unit (MCU). The electronics36 includes a power supply to provide power to the electronics 36. Theelectronics 36 includes a software algorithm to operate and control theleveling system. FIGS. 6-9 show schematic diagrams of electricalconnectivity between components of one embodiment.

The leveling software algorithm performed in the microcontroller of thecontroller housing 20 adjusts the leg movement system in a way that willdetermine the relationship between the sensor bar positions and the legsat the four corners of the table. This will allow any of the threesensor bars to be placed in any of the 3 pre-determined positions, oneat each end of the table in the “X” direction and one in the middle ofthe table in the “Y” direction. Once initialized, each sensor bar sendsdata of the angle of inclination to the MCU, which is then used insoftware algorithm to calculate adjustment of the leg movement system.The leg movement system includes components to raise and lower each legof the table. The results of the leveling software algorithm willprovide consistent inclination accuracy on par with a precisionmachinist level. The leveling system will also be able to determineusing software whether the gaming table is unable to be leveled due to:the table condition, poor support surface makes impossible to level,floor, etc. Since each sensor bar is fitted with a microcontroller andan ADC, the calibration data of each sensor bar can be stored internallyat each sensor bar. Having a microcontroller and an ADC on each sensorbar provides that the MCU does not need to keep track of which set ofcalibration data goes with which sensor bar. This would eliminate theneed for distinct connections of the sensor cables to the MCU.Optionally, the ADC and sensor calibration data could be stored insidethe MCU and not in the sensor bars. This requires the sensor bars, andcorresponding sensor cables connected between the sensor bars and MCU,to be distinctly labeled or have different electrical connectors to makesure the sensor bars are correctly connected to the MCU.

FIG. 10 shows a flow chart of a software algorithm that can be used frompower up of the controller system to the movement of the legs to levelthe table. The legs in FIG. 1 are labeled to correspond to the leglabels in the flow chart of FIG. 10. The X value is the inclinationaccuracy value. The (+) and (−) used for the X value in the algorithmcorrespond to the (+) foot and (−) foot of each sensor bar. FIG. 11shows a level bubble 38 that is typically used with a level 40. Thelevel has two lines 42, 44 used with the bubble 38 to indicate thedirection to move a surface to level the surface, where the surface islevel when the bubble 38 is between the two lines 42, 44. The lines 42,44 correspond to each foot of the sensor bar, where one line 42 of thelevel would be labeled (+) and one line 44 of the level would be label(−). So where the lines 42, 44 indicate the direction to level thesurface with the bubble, the (+) X value or (−) X value indicates thedirection to level the surface based on the position of the X valuebeing a (+) value or a (−) value. Each sensor bar acts like a digitallevel, where the virtual bubble is located in center of the sensorenclosure. The on-board microprocessor reads the inclination value ofthe inclinometer and stores the value to be reported to the MCU. Aproprietary protocol is used to transfer data between the Sensor Bar andthe MCU through a RS485 link on the sensor bar cables 14. The indicatorlight located on the sensor enclosure can be used to indicate if thesensor bar is level to within a predetermined accuracy. All the legs andsensor bars communicate to the MCU in order to provide a complete closedloop system.

When AC power is applied to the leveling system, the system willinitialize by assigning addresses (1 through 3) to the sensor bars thatare connected to the controller system. The sensor bar plugged into port1 is addressed as Sensor Bar 1, port 2 becomes Sensor Bar 2, and port 3becomes Sensor Bar 3. All communications are done between the controllersystem and the sensor bars through sensor ports by means of aproprietary protocol over a RS485 communications link using the sensorbar cables 14. After initialization as part of the operating system ofthe master control unit (MCU), the controller system will begin a taskthat will poll all three Sensor Bars periodically (currently 60 ms butcan be changed to increase efficiency) for inclination value data. Wherethe inclination values are X and the values will either be a (+) or (−),depending on the orientation of feet. The inclination value data fromthe sensor bars can be used by any other task when needed. It can alsobe displayed on the optional Touch Screen Display for the user toobserve.

Next, hardware interrupts are created for a raising limit and loweringlimit in each of the four legs (totaling 8 interrupts in all). The legmovement system is equipped with limit switches that indicate if eachleg has reached its maximum adjustment in either direction of up anddown. These signals are routed back to the MCU through the leg cables 24and after the interrupts are created, the interrupts will interrupt theMCU's process if a limit switch has been activated. The system will nowremain idle, with the only the sensor bar polling task running, untilthe user presses the main button 32 on the controller housing. A singlepush of the main button 32 will start the leveling process. The firststep is to initialize the table by moving all four legs so the table isat its lowest position. Depending on the power limitation of the powersupply of the controller system, two or four legs of the table can bemove at one time. Whereby, a larger power supply is required to movefour legs at a time, but economics and space may dictate using a smallerpower supply. The following steps will be explained assuming that thereis a limited power supply that can only handle moving two legs at atime. For reference purposes, please refer to FIG. 1 for locations oflegs 1-4 and sensor bars 1-3. The MCU applies voltage to leg movementsystem at both leg 1 and leg 2 so that the table is lowered. Thisvoltage will be supplied separately to the individual legs to operatethe leg movement system at each leg. The leg movement system at each legincludes a raising limit interrupt switch and lowering limit interruptswitch. Once the lowering limit switch is activated at each individualleg, the voltage is individually turned off at that leg. Once thelowering limit switches are triggered on both leg 1 and leg 2, theprocess is repeated for leg 3 and leg 4.

At this point, all 4 legs have their corresponding lowering limitswitches triggered. The leveling process will automatically begin. Thetable leveling will be done by initially running the leveling algorithma total of 5 times. The inclination accuracy will increase with eachloop of leveling algorithm until the desired value is achieved. Theamount of loops and accuracy may be change to change the desiredaccuracy and efficiency by the user. An additional 5 loops of theleveling algorithm will be run with the desired accuracy to ensure all 3sensor bars are settled.

The leveling algorithm shown in the flow chart of FIG. 10 will startwith inclination accuracy X value of ±0.05°. The process will firstlevel both the right end and left end of the table simultaneously, withthe assumption of sensor bar 1 is assigned to the left end and sensorbar 3 is assigned to the right end of the table. Data readings from allsensor bars take place periodically through the tasks of the algorithm.If the inclination value X of sensor bar 1 is positive, then voltage isapplied to the leg movement system at leg 1, so that the table willraise and make the inclination value of sensor bar 1 more negative.Conversely, if sensor bar 1 is data reading a negative inclination valueX, then voltage is applied to the leg movement system at leg 2 so thatthe table will raise there and thereby make the inclination value ofsensor bar 1 more positive. In the steps of the algorithm voltage willbe continued to be applied to the corresponding leg until theinclination of sensor bar 1 provides a data reading of an accuracywithin ±0.05°. If at any time the raising limit switch is activated atany of the legs, the process will abort and report an error to the user.

At the same time sensor bar 1 is being leveled to within an accuracy of±0.05°, sensor bar 3 will also attempt to achieve the same accuracy. Ifthe inclination value X of sensor bar 3 is positive, then voltage isapplied to the leg movement system at leg 3 so that the table will raiseand thereby make the inclination value X of sensor bar 3 more negative.Conversely, if sensor bar 3 data reading is a negative inclination valueX, then voltage is applied to the leg movement system at leg 4 so thatthe table will raise there and thereby make the inclination value ofsensor bar 3 more positive. In the steps of the algorithm voltage willbe continued to be applied to the corresponding leg until theinclination value X of sensor bar 1 is reading within an accuracy within±0.05°. If at any time the raising limit switch is activated in any ofthe legs, the process will abort and report an error to the user.

When the process of leveling both the sensor bar 1 and sensor bar 3 towithin the initial ±0.05° is complete, then the sensor bar 2 on thetable will be leveled to inclination value X within ±0.05°. Readings ofX values from all sensor bars are taking place periodically through thealgorithm tasks of leveling sensor bar 2. If the inclination value X ofsensor bar 2 is positive, voltage is applied leg movement system at leg1 and leg 2 simultaneously so that the table will rise to make theinclination value X of sensor bar 2 more negative. Conversely, if sensorbar 2 is reading a negative inclination value X, voltage is applied tothe leg movement system at leg 3 and leg 4 simultaneously so that thetable will rise to make the inclination of sensor bar 2 more positive.In the steps of the algorithm voltage will be continued to be applied tothe corresponding legs until the inclination value X of sensor bar 2 isreading with an accuracy within ±0.05°. If at any time the raising limitswitch is activated in any of the legs, the process will abort andreport an error to the user. This will complete the first loop of the 5loops of the leveling algorithm. In the next loop the desired accuracyof the inclination is increased to ±0.04° and the loop of leveling theright and left ends, then the middle is repeated. Repetition this loopand increasing the accuracy of inclination by ±0.01° until ±0.01° isachieved on all 3 sensor bars provides the 5 loops. To ensure stabilityand to minimize any error in leveling, the leveling algorithm isrepeated an additional five times with the accuracy of ±0.01°. At theend of these five loops, the process is complete. Notification ofcompletion to the user can be done through an indicator light or thedisplay.

The software algorithm could also include an auto-discovery algorithm oflegs of the table and the sensor bars, so that it will not matter whatport they are plugged into on the controller system. One way to performthe auto-discovery of legs of the table and the sensor bars is asfollows. With all of the leg cables and sensor bar cables connected tothe controller system and the three sensor bars positioned on the tableas shown in FIG. 1, first lower all legs so the table is in the lowestposition. Second, send addresses to sensor bars, where the sensor barconnected to port 1 becomes sensor bar 1, port 2 becomes sensor bar 2,port 3 becomes sensor bar 3. The addresses sent are communicationprotocol functions of the auto discovery algorithm. Third, apply voltageto raise leg “A”, making sure there is a spike in current draw on the DCmotor driver integrated circuit. Fourth, repeat this for leg “B”, leg“C” and leg “D”, so that all legs are on the surface supporting thetable. Fifth, take a data point snapshot of the inclination (±angle) ofsensor bar 1, sensor bar 2, sensor bar 3. Sixth, raise leg “A” for 5seconds and compare angles on sensor bar 1, sensor bar 2, and sensor bar3 to the original data point snapshot from fifth step. Sixth, note whichsensor bar (1, 2 or 3) that has the largest change in angle to which leg“A” can now be associated with that sensor bar, while noting whether thechange in angle is more negative or more positive. It is now known whenleg “A” is being raised, this sensor bar will change either morenegative or more positive. Seventh, lower leg “A” for 5 seconds toreturn to the starting point and repeat steps 5 through 6 for leg “B”,leg “C”, and leg “D”, so that all four legs are associated with makingone of the sensor bar's angle more positive or more negative. At thispoint, only two of the three sensor bars will have data associated andbecome known, which are the two sensor bars on the short ends of thetable. Eighth, chose one of the two sensor bars that have beenassociated and simultaneously raise two of the legs that have beenassociated with the same sensor bar, for 5 seconds. Compare the angle ofthe third sensor bar, which is the sensor bar that has not beenassociated yet, with the data point snapshot of Step 5. Note whether theangle became more negative or more positive. It is now established thatwhen these two legs are raised, third sensor bar will become morenegative or more positive. Associate the remaining two legs to theopposite direction (positive or negative) of the third sensor bar.Ninth, is an optional step to assign labels that can be used inreference to flowchart of FIG. 10. It is known, from step 7, the twosensor bars that are located on the short ends of the table. Take thefirst sensor bar (lowest numerical address) and label the leg that madethat sensor bar more negative when raised as “leg 1”. Associate the legthat made the same sensor bar more positive when raised as “leg 2”. Nowobserve the second, short end sensor bar from step 7 and label the legthat made the sensor bar more negative when raised as “leg 3”. Theremaining leg should be responsible for making this second sensor barmore positive when raised and should be labeled “leg 4”.

A first embodiment of the leg movement system is shown in FIGS. 12-18.The first embodiment includes motorized legs at each corner of thetable, where each leg 50 of the table includes a motor 52 to adjust legheight. FIG. 12 shows an example of one of the legs supported by a legfoot 54. FIG. 12 also shows a leg cable port 56. Each motorized legutilizes a DC gear motor 52 mounted within the leg 50 and mated to adrive bolt 58 in FIGS. 13-14. The drive bolt 58 is threaded and screwsthru a position nut 60 secured in the bottom of the leg 50. The drivebolt 58 is connected to the foot 54 that is used to makes contact withthe surface that supports the table, as shown in FIG. 15. The drive bolt58 is supported by the foot 54 using a thrust bearing inside the foot54. Support by the thrust bearing allows the drive bolt 58 to turnfreely about the foot 54 without the foot 54 also turning. The motor 52is attached to a motor support 62 mounted to a leg support 64 in the leg50, as shown in FIGS. 14-15. The motor 52 is attached so that the motor52 can travels up and down within the leg 50 along the motor support 62,so that the motor 52 can move with the drive bolt 58. FIGS. 16-18 showthe motor support 62. The motor support 62 includes a motor carrier 66attached between two motor carrier side mounts 68. Each motor carrierside mount 68 attaches to the leg support 64. Each motor carrier sidemount 68 includes an upper travel slot 70 and lower travel slot 72. Themotor carrier 66 includes two upper slide pins 76 and two lower slidepins 74. The upper slide pins 76 ride in the upper travel slots 70 andthe lower slide pins 74 ride in the lower travel slots 72, which allowthe motor carrier 66 to move up and down the length of the travel slots70, 72. The motor 52 is mounted to the motor carrier 66, so the motor 52can travel up and down the length of the travel slots 70, 72. Each motorcarrier side mount 68 includes a limit switch. FIG. 18 shows an upperlimit switch 78 which may be engaged by one of the upper slide pins 76and a lower limit switch 80 which may be engaged by one of the lowerslide pins 74. The upper limit switch 78 and the lower limit switch 80are used to prevent over travel by the motor 52 and hence the drive bolt58.

The motor 52 is connected to the leg cable port 56 of the leg 50. Theleg cable port 56 provides power to the motor 52. Each leg cable 24connects the motor 52 of each leg 50 to the MCU of the controllersystem. The MCU sends power to each motor 52 to turn the drive bolts 58in order to raise and lower the leg 50. For example, FIG. 14 shows theleg 50 in the lowest position. When the motor 52 in the leg 50 isactivated by the MCU, the motor 52 will be commanded to turn the drivebolt 58 in the direction that causes the leg 50 to rise due to therelationship between the drive bolt 58 and the position nut 60. Theposition of the drive bolt 58 in the position nut 60 determines theamount of the drive bolt 58 that extends out from the bottom of the leg50. So as the drive bolt 58 screws out of the bottom of the leg 50, theleg 50 rises along the drive bolt 58 due to the foot 54 having contactwith a support surface, as shown in FIG. 15. The reverse is true whenthe leg 50 is to be lowered. The leg 50 is lowered by commanding themotor 52 to turn the drive bolt 58 so that the drive bolt 58 retractsinto the leg 50 and the leg 50 moves downward along the drive bolt 58.The feet 54 are mechanically adjustable with a wrench and are removable.This will allow the user to still be able to adjust the height of thelegs 50 without the need for the motorized legs to be operational. Themotor 52 can also be mounted to an outside mount (not shown) thatattaches to the outside of the leg 50 in a removable manner. The legcable port 56 would be mounted to the outside mount and so would theposition nut 60. The position of the drive bolt 58 in the position nut60 determines the amount of the drive bolt 58 that extends out from thebottom of the leg 50. So as the drive bolt 58 screws out of the bottomof the leg 50, the leg 50 rises along the drive bolt 58 due to the foot54 having contact with a support surface, as shown in FIG. 15. Thereverse is true when the leg 50 is to be lowered. The leg 50 is lower bycommanding the motor 52 to turn the drive bolt 58 so that the drive bolt58 retracts into the leg 50, so that the leg 50 moves downward along thedrive bolt 58. Over travel upward by the leg 50 is prevented when theupper limit switch 78 is engaged by the upper slide pin 76. Over traveldownward by the leg 50 is prevented when the lower limit switch 80 isengaged by the lower slide pin 74.

A second embodiment of the leg movement system is shown with itscomponents in FIGS. 19-29. The second embodiment includes a motorizedexternal jack system for each leg 50, as shown in FIG. 19. The motorizedexternal jack system includes a jack assembly and motor assembly. FIGS.20-29 show components of the jack assembly without the motor assembly.The jack assembly includes a base plate 90, two jack towers 92, driveassembly and a foot plate 94. As shown in FIGS. 19-20, the foot 54 ofthe leg 50 of the table is positioned on the foot plate 94 of the jackassembly. The base plate 90 contacts the surface that supports the leg50 of the table. Each end of the base plate 60 includes one of the jacktowers 92 extending upward. The drive assembly includes a jack screw 96,drive screw 98, chain sprockets 100 and a chain 102, as shown in 22. Thejack screw 96 is rotatably mounted in a first jack tower 92 and thedrive screw 98 is rotatably mounted in a second jack tower 92. Each jacktower 92 includes bearings 105 to hold the jack screw 96 and drive screw98 in place and allow rotation of the jack screw 96 and drive screw 98.The chain sprockets 100 are fixed one each to the jack screw 96 anddrive screw 98, as shown in FIG. 23. The chain 102 is attached betweenthe chain sprockets 100, so that movement of one sprocket 100 causesmovement of the chain 102 and movement of the other sprocket 100. Thedrive screw 98 includes a drive shaft 104 extending upward from thesecond jack tower 90, such that rotation of the drive shaft 104 causesrotation of the drive screw 98. Rotation of the drive screw 98 causesrotation of the sprocket 100 on the drive screw 98, which in turn causesrotation of the sprocket 100 on the jack screw 96 due to the connectionof the chain 100. Rotation of the sprocket 100 on the jack screw 96causes rotation of the jack screw 96.

The foot plate 94 includes two nut plates 106 attached to the foot plate94, as shown in FIGS. 22-23. Each nut plate 106 includes a threaded hole108 to receive the threads of the jack screw 96 and the drive screw 98.As the drive screw 98 rotates within the nut plate 106, the rotation ofthe drive screw 98 causes the nut plate 106 to move either up or downalong the drive screw 98, depending on the direction of the rotation ofthe drive screw 98. While the drive screw 98 is rotating, the jack screw96 rotates due to the chain connection 102. Rotation of the jack screw96 causes the nut plate 106 attached to the jack screw 96 to move eitherup or down along the jack screw 96, depending on the direction of therotation of the jack screw 96. Since the foot plate 94 is attached tothe nut plates 106, rotation of the drive screw 98 causes movement ofthe foot plate 94, due to the movement of the nut plates 106 along thejack screw 96 and the drive screw 98.

The motor assembly includes a motor housing 108, handle 110, leg cableport 112, light 114, push button switch 116, tower receiver 118, motor52 and limit switch assembly, as shown in FIGS. 24-25. The handle 110mounts to the motor housing 108 and is used attach and remove the motorassembly from the jack assembly. The leg cable port 112 is located onthe top of the housing 108 and connects to the leg cable 24 to providepower to the motor 52. The light 114 is mounted on the bottom of themotor housing 106 to provide light about the leg movement system. Thelight 114 is connected to the leg cable port 112 for the reception ofpower to control light functions. The push button switch 116 is mountedabove the handle 110 for easy activation and is connected to the legcable port 112 for communication back to the MCU. The push button switch116 is used to manually jog the motor 52 in the direction that raisesthe foot plate 94 of the jack assembly. The tower receiver 118 ismounted on the bottom of the motor housing 108. The tower receiver 118is an open ended shape to match the shape of the jack tower 92 thatincludes the drive screw 98. The jack tower 92 and the open ended shapeof the tower receiver 118 are shown as a square cylinder. The jack tower92 and the open ended shape of the tower receiver 118 can be any shapeas long as the jack tower 92 and the open ended shape of the towerreceiver 118 are matched up so that jack tower 92 can be inserted intothe tower receiver 118 so that the jack tower 92 and tower receiver 118interlock together. The jack tower 92 and the tower receiver 118 areinterlocked together to prevent rotation of the tower receiver 118 aboutthe jack tower 92 during use of the motor 52. The motor 52 is mounted inthe motor housing 108 in a fixed position. The motor 52 is mounted sothat the motor shaft 120 aligns with the drive shaft 104 of the drivescrew 98. The motor shaft 120 and the drive shaft 104 are a square shapethat each fit into a coupler 122 having a square shaft receiver, so asto interconnect the motor shaft 120 and the drive shaft 104. With theinterconnection of the motor shaft 120 and the drive shaft 104, rotationof the motor shaft 120 causes the rotation of the drive shaft 104 toproduce movement of the foot plate 94. The coupler 122 is shown with setscrews 124 to retain the coupler 122 on the motor shaft 120. The motorassembly as described allows for easy removal of the motor assembly fromthe jack assembly. When needed, the motor assembly is placed over thejack tower 92 with the drive shaft 98, so that the jack tower 92 isinserted into the tower receiver 118. When the jack tower 92 is insertedinto the tower receiver 118, the drive shaft 104 of the drive screw 98inserts into coupler 122. The push button switch 116 is also used tomanually jog the motor 52 to align the coupler 122 to the drive shaft104 during installation of the motor assembly onto the jack tower 92.The motor assembly can then be used to move the foot plate 94. FIG. 24shows the foot plate 94 at its lowest point, whereby when the foot 54 ofthe table is supported by the foot plate 94, the leg 50 supported willbe at its lowest point. FIG. 25 shows the foot plate 94 at its highestpoint, whereby when the foot 54 of the table is supported by the footplate 94, the leg 50 supported will be at its highest point. Hence, theheight of the corner of the table can be adjusted within the position ofthe lowest point and highest point of movement of the foot plate 94.When the table is level and the motor assembly is no longer needed, themotor assembly can be easily removed by pulling the motor assembly awayfrom the jack tower 92. The motor assembly can be removed so that it isno longer in the way of the user of the table.

The limit switch assembly is shown in FIGS. 24-29. The limit switchassembly includes a rod 126, rod mount plate 128, spring 130, upperlimit switch 132 and lower limit switch 134. The rod mount plate 128mounts to the motor housing 108. The rod mount plate 128 includes atravel slot 136. The rod 126 includes a slide pin 138 extending from therod 126. FIG. 29 shows a bottom view of the motor housing 108 thatincludes a linear bearing with a rod guide hole 140. The rod 126 ismovably mounted to the rod mount plate 128 and the rod guide hole 140 ofthe linear bearing. The spring 130 is connected between the rod mountplate 128 and the slide pin 138. The upper limit switch 132 is mountedto the rod mount plate 128 and above the travel slot 136, so that theupper limit switch 132 can be engaged by the slide pin 138. The lowerlimit switch 134 is mounted to the rod mount plate 128 and below thetravel slot 136, so that the lower limit switch 134 can be engaged bythe slide pin 138. The rod 126 extends downward from the motor housing108 and contacts the nut plate 106. The rod 126 is retained against thenut plate 106 due to the spring 130 being a tension spring that pullsthe rod 126 downward against the nut plate 106. The rod 126 moves upwardand downward due to the movement of the nut plate 106. When the footplate 94 is raised, the rod 126 moves upward due to the nut plate 106forcing the rod 126 upwards and at the same time the slide pin 138travels upward in the travel slot 136. When the foot plate 94 islowered, the rod 126 moves downward due to the spring 130 pulling backon the rod 126 and at the same time the slide pin 138 travels downwardin the travel slot 136. Over travel upward by the leg is prevented whenthe upper limit switch 132 is engaged by the slide pin 138. Over traveldownward by the leg is prevented when the lower limit switch 134 isengaged by the slide pin 138.

Each leg 50 of the table is placed so that the foot 54 of the table issupported by the foot plate 94 of the jack assembly. Each motor 52 ofthe motorized external jack system is connected to each leg cable port112. The leg cable ports 112 provide power to the motors 52. The legcables 24 connect the motors 52 of each motorized external jack systemto the MCU of the controller system. The MCU sends power to each motor52 to turn the drive screws 98 in order to raise and lower the legs 50.For example, FIG. 24 shows the foot plate 94 in the lowest position.When the motor 52 is activated by the MCU, the motor 52 will becommanded to turn the drive screw 98 in the direction that causes theleg 50 to rise due to movement of the foot plate 94 upward, as shown inFIG. 25. The reverse is true when the leg 50 is to be lowered. The leg50 is lowered by commanding the motor 52 to turn the drive screw 98 sothat the foot plate 94 moves downward.

There are other optional additions to the leveling system. A DC batterycan be used for operational power to eliminate the need for AC powercord. A mobile application for a smartphone that allows for systemcontrol, system status, and provides system notifications wirelesscommunication can be added. Wireless sensor communication can beemployed to eliminate the need for sensor bar cabling.

While different embodiments of the invention have been described indetail herein, it will be appreciated by those skilled in the art thatvarious modifications and alternatives to the embodiments could bedeveloped in light of the overall teachings of the disclosure.Accordingly, the particular arrangements are illustrative only and arenot limiting as to the scope of the invention that is to be given thefull breadth of any and all equivalents thereof.

We claim:
 1. A leveling system for leveling a table having a top surfaceand at least three legs, comprising: at least three sensor bars that actas individual digital levels adapted to be placed on top surface of thetable; a leg movement system adapted to be attached to the table andadapted to raise and lower the legs to achieve a level top surface; acontroller system that is connected to said sensor bars to receive datafrom said sensors bars and to said leg movement system to commandmovement of said leg movement system that is adapted to raise and lowerthe table, said controller system including a leveling softwarealgorithm which inputs said data from said sensor bars and controlsactivation of said leg movement system; wherein each of said sensor barsincludes an accelerometer to sense inclination of said sensor bar andprovide inclination data to said controller system; and wherein each ofsaid sensor bars includes further includes microcontroller and an analogto digital convertor to store and provide inclination data to saidcontroller system.
 2. A leveling system for leveling a table having atop surface and at least three legs, comprising: at least three sensorbars that act as individual digital levels adapted to be placed on topsurface of the table; a leg movement system adapted to be attached tothe table and adapted to raise and lower the legs to achieve a level topsurface; a controller system that is connected to said sensor bars toreceive data from said sensors bars and to said leg movement system tocommand movement of said leg movement system that is adapted to raiseand lower the table, said controller system including a levelingsoftware algorithm which inputs said data from said sensor bars andcontrols activation of said leg movement system; wherein each of saidsensor bars includes an accelerometer to sense inclination of saidsensor bar and provide inclination data to said controller system; andwherein said controller system includes a microcontroller, DC motordriver integrated circuits, an analog-to-digital integrated circuit anda power supply.
 3. The leveling system of claim 2, wherein said powersupply provides power for both said controller assembly and saidmovement assembly.
 4. A leveling system for leveling a table having atop surface and at least three legs, comprising: at least three sensorbars that act as individual digital levels adapted to be placed on topsurface of the table; a leg movement system adapted to be attached tothe table and adapted to raise and lower the legs to achieve a level topsurface; a controller system that is connected to said sensor bars toreceive data from said sensors bars and to said leg movement system tocommand movement of said leg movement system that is adapted to raiseand lower the table, said controller system including a levelingsoftware algorithm which inputs said data from said sensor bars andcontrols activation of said leg movement system; and wherein said legmovement system comprises a jack for each leg of the table that isadapted to be removably attached to the leg to raise and lower the leg,each of said jack connected to said controller assembly to be commandedto raise and lower each of said jack.
 5. The leveling system of claim 4,wherein each of said jack includes a movable foot plate adapted toreceive and retain a bottom of a leg of the table; wherein each of saidfoot plate is moveably to raise and lower said leg; and wherein saideach of said foot plate is interconnected to a base that is adapted tocontact a support surface so that said base supports said moveable footplate.
 6. The leveling system of claim 5, wherein each of said jackincludes a motor interconnected to said foot plate to move said footplate up and down.
 7. The leveling system of claim 6, wherein each ofsaid jack includes a jack screw and a drive screw; wherein each of saidjack screw and said drive screw includes a sprocket; wherein each ofsaid jack includes a chain attached to said sprocket such that if onesprocket turns, then the other sprocket turns due to said chain; whereina motor shaft of each of said motor is connected to said drive screw,and wherein said foot plate is interconnected to a set of said drivescrew and said jack screw to move said foot plate up and down due torotation of said motor shaft.
 8. The leveling system of claim 7, whereineach of said motor drive shaft is attached to each of said drive screwin a way that said motor drive shaft and said motor can be removedwithout tools from said leg movement system.
 9. The leveling system ofclaim 4, wherein each of said jack includes a motor interconnected by adrive bolt to a foot, said each of said foot is adapted to contact asupport surface so that each of said foot supports each leg.
 10. Theleveling system of claim 9, wherein each of motor is mounted inside eachof the leg of the table such that said drive bolt is adapted to extendout of the leg and connect to said foot; and wherein each of said drivebolt moves in and out of the leg to lower and raise the leg.